Concrete mixer



May 1, 1923,

` D. B, MARTIN ET AL Y CONCRETE MIXER.,

Filedv Dec. l5 1921 llnven'ors. David mei/fin :Rahn Wesevby Patented May l, 1923.

Unirse 1,453,634? .smearoFFHCEf DAVID BUFDINGTON MARTIN AND JOHN wEsTniaBv,y or HAGERsvILLE, oNTAnI'Q.

, CANADA. v .f

CONCRETE MIXER.

Application filed December 15, 1921. Serial ll'o. 522,572; y

To all whom it may concern:

Be it known that we7 DAVID BUFFINGTON MARTIN and JOHN l/Vns'rnnr, of the village of Hagersville, in the cbunty of Haldimand,

in the Province ot OntariopDominion of Canada, have invented certain new and useful Improvements in Concrete Mixers, of which the following is :1J-specification.

Our invention relates to improvements "in 10 concrete mixers with more particular referi ence to the smaller type adapted to be operated by hand or motor, and the objects of the invention are among others to devise a machineA which will be of strong and dur able construction but which may be produced at small cost; a further object is to devise a machine which 'may be conveniently operated by hand and may also be readily fitted for power drive; and a still further vobject is to produce a machine which will be eliicient` in operation. v

Our invention consists essentially of a rigid portable main frame, a rocking frame freely supported within the main trame, a mixer drum open at one end closed at the other end rotatably supported by-therocking frame in a substantiallyhorizontal position, the drum adapted to be tilted downwardly and upwardly as the rocking Jframe is rocked within the mainframe and means Jfor` rotating the drum about its longitudinal axis, all as hereinafter more particularly described andillustrated in the accompanying drawings in which,

invention yshowing themixer drumin the dumping position.

Fig. 2 is a rear end elevation of the rocking frame and mixer drum.

Fig. 3 is a transverse section through the mixer drum showing a series of angle bars secured to the interior of the drum and constituting vanes or paddles therein. Fig.- 4 is a vertical section' on the line i5 4, 4 of Fig. 2 showing the method of mounting the rear end of the `mixer drum.

In the drawings like characters of refer-l ence indicate corresponding parts in the different views. Y

l indicates the main frame having the two base side members 2'ma'deof angle bars. 3 `are side members composed of' angle bars each of whichris suitably miteredl at A and bent upwardly at eachl endtoform fthe corner uprights 4.

llength thereof.

ing the corner uprights 4.

Fig. l is a general perspective View of our 5 are top frame members also composed of angle bars and connect thertops of the 'corner uprights 4.

6 are longitudinally disposed angle bar members eachsecured at its ends'- to-jthe corner uprights 4 The-lower portion oi'lea'ch side member-3 is secured'to the adjacent base member 2.

74 are -lattice strips connecting the base members 2 while 8 are lattice strips connect- 9 is a transverse bar secured tothe rear corner uprights 4 'adjacent to" theltop thereof. f

l0 are two V-shaped members each formed from a single angle bar having ail-portionE of the web cut away atfll to permit ythe bending to the bar to form the V`sl`1apec`lmem ber. One ot these members is mounted at 6o f intermediately tot the v each sideof the main frame, the apex `of the V resting upon the top; of the longitudinal bar 6 and the upper endsbeing :secured to the top members 5 kat 12. y

10 are"loc ated The V-shaped members diametrically opposite each other'withinthe t main frame at each side thereof with the`l internal angles of the bars tac-ing inwardly and thus constituting a rocker `guidedrame within the main framefi if 13 are al pair of road wheelssupported j below the' `rear end of the *mainI frame 'upon the axle 14. I

15 is a cross shaftfjournalledinubearing i l blocksy 16 supported belowl the f members 6.

The ends of lthe shaft projvectbeyond thef s'ides of the main frame.

17 is a pulleyrigidly -carried by onelend Vof the shaft l5 outside `ofthe mainframe and 18 is a sprocket ywheel carried'by the other end of said shaft. 1

19 is a rocking frame comprising a're'cfv i tangular top portion 2O composed of angle bars suitably secured together and a pair of V-shaped depending portions'r26; l

' The V-shaped lportions-26 are m'adefilfrom" angle bars .mitered at Bfto permitbending of the bar tothe V form and'` the l*upper ends are secured at 27, to thetop `frame por-y i tion 20.

f j The 1V -shaped portions 26"`are locate'done at each side ofthe rocking frame and the apex angle thereof is considerably 'less than that of the `s"haped'members1r0 inI the main frame, while the perpendicular Y altitude fof the V is greater than in the case of the member 10.

28 are a series of rollers rotatably supported between arched frame portions 29 extending transversely of the rocking frame and secured to the side members of the top at 30.

31 is a cylindrical mixer drum open at its front end and closed at its rear end.

32 are strengthening circumferential hoops carried by the drum.

33 is a circular plate provided with the circumferential flangev 34 and encases the rear end of the drum 31 `being secured thereto by the rivets or bolts 35.

36 is a bevel crown wheel which is secured concentrically to the plate 33 so that the gear teeth thereof face rearwardly.

37 is a bearing block secured to the rear cross member of the portion 20 of the rocking frame and has the metal above the bearing orifice therein cut away at 38 for a purpose as will presently appear,

39 is a flanged stub shaft extending` axially f rearwardly from the drum to which it is secured by the rivets 40.

The shaft 39 is provided near its outer end with an annular recess 41, the width of the recess being `slightly greater than that of the bearing block 37 and the reduced portionof the shaft forming a journal engaging the bearing surface of the block 37.

42 is a cotter pin extending through the bearing block 37 adjacent to the top thereof.

43 is a transversely disposed hand operating crank mounted in a bearing bracket 44 carried at one side of the rocking frame at the rear thereof, 45 being thrust rings carried by the crank at each side of the bearing bracket 44.

46 is a bevel pinion carried by the inner end of the crank 43 and meshes with the teeth of the crown wheel 36.

47 is a sprocket wheel carried by the crank 43 and is in alignment with the sprocket 18.

48 is a chain operatively connecting the sprockets 18 and 47.

49A is a bent dumping handle which is pivotally mounted upon the bar 9 at 50.

The inner end of the handle 49 is connected to the rear of the rocking frame by a link 51. Y

52 are a series of spaced angle bars secured to the inside of the drum 31 and extending longitudinally thereof. rllhese bars constitute baffle 'vanes within the drum.

The construction and operation of our invention is as follows x i It will be evident that the main frame constitutes a portable rigid frame of simple l and inexpensive construction.

. The rocking frame 19 is adapted to be detachably mounted within the main frame so that the V-shaped portions 26 engage the interior angles of the V-shaped portions 10,

the apices of the members 26 engaging the apices of the members 10.

Since the apex angle of the rocking frame 19 is less than that of the rocker guide frame 10 it will be evident that the rocking frame l portions and, it is further to be noted that since the altitude of the V-shaped portions 26 is greater than that of the members 1U that the rocking frame 19 will project above the top of the main frame.

The drum 31 is rotatably mounted upon the rocking frame the journal portion of the stub shaft 39 engaging vthe bearing ori- `fice in the block 37 and the front end of the drum being supported by the intermediate hoop 32 engaging the rollers 28.

In the mounting of the drum the bearing block 37 engages the annular recess 41 in the stub shaft 39, the ournal portion of said shaft passing downwardly through the cut away portion 38 of the block 37 and having bearing engagement with the bearing orifice therein. Accidental disengagement is prevented by the cotter pin 42.

Longitudinal movement of the drum `is prevented by the engagement of the sides of the annular recess 41 with the sides of the bearing block 37.

The crank handle 43 is now mounted and the sprockets 18 and 47 connected by the chain 48.

F or power drive the pulley 17 may be connected by a belt (not shown) to any suitable motor. f

In Fig. 1 the device is shown in the dumping position in which its front open end is tilted downwardly.

in the charging and mixing position the rocking frame would be oscillated backwardly so that the rear arms 26 of the rocking frame would be resting upon the rear arms 10 of the main frame,in which position the open end of the drum would be tilted upwardly.

Considering first the application to a hand operated machine, the operation is as follows.

The rocking frame is oscillated' rearwardly to place the drum in the charging p position and the desired mixture is put into the drumr after which, upon turningthc crank 43, the drum is rotated, the van-es r52 assisting in the thorough mixing of the concrete. The front end of the drum rolls on the rollers 28. f Y,

The machine is dumped by simply oscillating the rocking frame forwardly by the dumping handle 49 and as soon as the roeking frame has passed the centre of'its swing it falls forward by gravity and stops with a jar in its forward position (see F ig. 1)

` as the front arms 26 of the rocking frame engage the front arms l of the main frame.

. simple as it is simply necessary to connect a beltfrom a suitable motor to the pulley 17 and the operation of the machine is identical with that already described, the drum being rotated through the medium of the sprockets 18 and 47 and the chain 48.

In order to overcome any seriousloosen ing of the chain 48 as the frame 19 is oscil- .lated the shaft l5 is located to coincide as lnearly asvpossible with the axis of oscillation of the frame, i. e. to the apices of the V-shaped members 26 and 10.

Hitherto in concrete machines the drum has been rotated by a spur gear Wheel en circling the circumference of the drum Which has Ibeen engaged by a spur pinion having its axis parallel to the longitudinal axis of the drum. This has involved the use of a longitudinally extending operating shaft with the crank handle extending rearf Wardly of the machine.

This construction has rendered operation inconvenient since. the rise and fall of the handle has been considerable as the drum is tilted. Also the application of power drivel has been complicated.

With our machine by the use 'of thel bevel crown Wheel at the rear end of the drum, the teeth of which face rearwardly, this is overcome and it is possible to have the crank handle extend laterally from the frame.

A further valuable feature of our machine is the convenient form in which it may be placed for transporting since the entire rocking frame With the drum is simply removed from the main frame, turned upside down and the drum is accommodated Within the main frame.

Formerly in these machines l the frame was pivotally mounted upon a carriage and frame, no independent tilting of the drum being provided for. This involved a large cumbersome machine and further, consid-` erable troubleand inconvenience in operation vWas experienced due to the vibration caused by the method of supporting the machine upon a carriage With the consequent movement and vibration ofthe road Wheels. This .is overcome in our machine due to the construction whereby the drum may be independently tilted Within a `'rigid frame which is directly supported upon the ground without the use of any carriage. f'

From the foregoing it will be apparent that We have devised valuable improvements in concrete mixers Which Will enable the cost to be greatly reduced by simplifying the construction and Which Will also render the operation and use of this typekof machine more convenient. i

`Various modifications may be rnade in our invention Without departing l from` the spirit Vthereof or the` scope of the claims and therefore the exact construction shown `is `to be taken as illustrativeonly and not in a limiting sense.

What We claim as our invention is: l. In a concrete mixer the combination with the rigid main frame thereof, of la V- shaped rocker guide frame Within themain frame, a rocking frame` comprising a de pending V-shaped portion the apex angle of which is less than that of the aforesaid guide frame, the rocker frame freely mounted Within the main frame sok that the external apex of the depending V-shaped portion thereof engages the internal apex of the v'guide frame, the rocking frame being free to be oscillated about the engaging apices, and a mixing drum rotatably carried by the. rocking frame. v

2. Ina concrete mixer thecombination With the rigid main frame thereof, of a rocker guide framevvithin the main frame` rocked guide frame, the altitude of the rocking frame being greater than that of the rocker guideframe, the rocking frame being freely mounted Within the mainframe so `that the apices of the depending vportions the drum Was tilted as a unit With the main thereof engage the apices of the rocker guide frame, the inclined ymembers `of the sav rocking frame adapted to engage the inclined membersv of the guide frame for `limiting the oscillation of the rocking frame therein and a mixing drum rotatably carried by the rocking frame and disposed longitudinally thereof, saiddrum being open at j one end and closed at the other. v

DAVID BUFFINGTON MARTIN. JOHN WESTERBY.

c Witnesses:

' WM. C. HOLMES,

KATHLEEN DIXON. 

